From: Quinn Tran <quinn.tran@xxxxxxxxxx>
Max boundary for exchange off load is 32k exchanges. If a system
is unable to allocate large memory buffer to support this feature,
then driver will reduce the number of exchanges down to a value
system can support.
Signed-off-by: Quinn Tran <quinn.tran@xxxxxxxxxx>
Signed-off-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
---
drivers/scsi/qla2xxx/qla_def.h | 3 +++
drivers/scsi/qla2xxx/qla_os.c | 39 ++++++++++++++++++++++++++++++---------
2 files changed, 33 insertions(+), 9 deletions(-)
diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 969a7dee9f72..043dd51a2760 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -288,6 +288,8 @@ struct name_list_extended {
#define ATIO_ENTRY_CNT_24XX 4096 /* Number of ATIO entries. */
#define RESPONSE_ENTRY_CNT_FX00 256 /* Number of response entries.*/
#define FW_DEF_EXCHANGES_CNT 2048
+#define FW_MAX_EXCHANGES_CNT (32 * 1024)
+#define REDUCE_EXCHANGES_CNT (8 * 1024)
struct req_que;
struct qla_tgt_sess;
@@ -3506,6 +3508,7 @@ struct qla_hw_data {
uint32_t using_lr_setting:1;
} flags;
+ uint16_t max_exchg;
uint16_t long_range_distance; /* 32G & above */
#define LR_DISTANCE_5K 1
#define LR_DISTANCE_10K 0
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 987bade1c606..029b95b2bd8a 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -2789,6 +2789,7 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
ha->init_cb_size = sizeof(init_cb_t);
ha->link_data_rate = PORT_SPEED_UNKNOWN;
ha->optrom_size = OPTROM_SIZE_2300;
+ ha->max_exchg = FW_MAX_EXCHANGES_CNT;
/* Assign ISP specific operations. */
if (IS_QLA2100(ha)) {
@@ -4230,6 +4231,9 @@ qla2x00_number_of_exch(scsi_qla_host_t *vha, u32 *ret_cnt, u16 max_cnt)
u32 temp;
*ret_cnt = FW_DEF_EXCHANGES_CNT;
+ if (max_cnt > vha->hw->max_exchg)
+ max_cnt = vha->hw->max_exchg;
+
if (qla_ini_mode_enabled(vha)) {
if (ql2xiniexchg > max_cnt)
ql2xiniexchg = max_cnt;
@@ -4259,8 +4263,8 @@ int
qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
{
int rval;
- u16 size, max_cnt;
- u32 temp;
+ u16 size, max_cnt;
+ u32 actual_cnt, totsz;
struct qla_hw_data *ha = vha->hw;
if (!ha->flags.exchoffld_enabled)
@@ -4277,16 +4281,19 @@ qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
return rval;
}
- qla2x00_number_of_exch(vha, &temp, max_cnt);
- temp *= size;
+ qla2x00_number_of_exch(vha, &actual_cnt, max_cnt);
+ ql_log(ql_log_info, vha, 0xd014,
+ "Actual exchange offload count: %d.\n", actual_cnt);
+
+ totsz = actual_cnt * size;
- if (temp != ha->exchoffld_size) {
+ if (totsz != ha->exchoffld_size) {
qla2x00_free_exchoffld_buffer(ha);
- ha->exchoffld_size = temp;
+ ha->exchoffld_size = totsz;
ql_log(ql_log_info, vha, 0xd016,
- "Exchange offload: max_count=%d, buffers=0x%x, total=%d.\n",
- max_cnt, size, temp);
+ "Exchange offload: max_count=%d, actual count=%d entry sz=0x%x, total sz=0x%x\n",
+ max_cnt, actual_cnt, size, totsz);
ql_log(ql_log_info, vha, 0xd017,
"Exchange Buffers requested size = 0x%x\n",
@@ -4297,7 +4304,21 @@ qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
ha->exchoffld_size, &ha->exchoffld_buf_dma, GFP_KERNEL);
if (!ha->exchoffld_buf) {
ql_log_pci(ql_log_fatal, ha->pdev, 0xd013,
- "Failed to allocate memory for exchoffld_buf_dma.\n");
+ "Failed to allocate memory for Exchange Offload.\n");
+
+ if (ha->max_exchg >
+ (FW_DEF_EXCHANGES_CNT + REDUCE_EXCHANGES_CNT)) {
+ ha->max_exchg -= REDUCE_EXCHANGES_CNT;
+ } else if (ha->max_exchg >
+ (FW_DEF_EXCHANGES_CNT + 512)) {
+ ha->max_exchg -= 512;
+ } else {
+ ha->flags.exchoffld_enabled = 0;
+ ql_log_pci(ql_log_fatal, ha->pdev, 0xd013,
+ "Disabling Exchange offload due to lack of memory\n");
+ }
+ ha->exchoffld_size = 0;
+
return -ENOMEM;
}
}
--
2.12.0
